How to obtain it. 215, 
which may be found on some of the marginal plants, grasses, etc. 
The larval stage of these insects is passed in the water, where they 
are free swimming crawling creatures, predatory in their habits, 
and do not possess a protective shell of any kind. Most of them 
thrive best in running water, and if once introduced, and the 
water suits them, they multiply rapidly. The various methods of 
introducing flies to unstocked waters are well worthy of con- 
sideration. The work, like most others, has its difficulties, but I 
apprehend that there is no reason why these apparent difficulties 
should not be bridged over. Many of the larvee are very sensitive 
to changes of water, and this is one of the difficulties that we have 
to contend with. It can be overcome by using care in trans- 
planting. The creeper, or larvee of the stone fly, is very tenacious 
of life, but even it requires care in its treatment, or it will not 
always be found to succeed on being introduced to “ pastures 
new.” 
The alder fly (Siadis Zutaria), the black fly which folds its 
wings along its back, and spends much time sitting on a fence in 
the sun or bobbing about on the water in swarms, is best moved 
in its egg stage. It lays a hundred eggs or more, which are 
deposited in neat-looking rows on herbage near the water. Careful 
observation would soon discover these, and it would be much 
safer and easier to collect and transmit them than to catch and 
carry the larvee, and there would be a-much better chance of a 
good result. The introduction of the perfect insect is a mistake, 
and is probably useless, unless ample protection is given to them 
and also to their eggs. In the case of some species it may be 
done by building an insect house, and having had considerable 
experience as an entomologist, and bred and reared thousands of 
insects in this way, I can speak with tolerable certainty as to the 
result. But there are few persons probably who could, or would, 
devote the time required to look after such an undertaking, and 
without proper attention it would be a failure. 
Previously to the deposition of the eggs, it may be noticed 
that both caddis and stone flies carry them in a bunch at their 
posterior extremities ; and what angler does not know the grannom 
fly, or green tail? a brown-looking fellow, who often carries a 
bunch of greenish-looking eggs behind him. They are exceed- 
